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rule win_unidentified_104_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.unidentified_104." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.unidentified_104" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 488bd7 488bcb e8???????? 488b5c2450 488b6c2458 488b742460 4883c440 } // n = 7, score = 100 // 488bd7 | dec eax // 488bcb | add edx, eax // e8???????? | // 488b5c2450 | dec esp // 488b6c2458 | xor eax, edx // 488b742460 | dec eax // 4883c440 | mov dword ptr [esp + 8], edx $sequence_1 = { 4c03d6 4c89542420 488b542408 4933ca 4c8bd1 49c1ea3f 488d0409 } // n = 7, score = 100 // 4c03d6 | dec ecx // 4c89542420 | xor edi, edx // 488b542408 | dec eax // 4933ca | mov ecx, edi // 4c8bd1 | dec eax // 49c1ea3f | shr edi, 0x18 // 488d0409 | dec eax $sequence_2 = { 48897e10 48897e18 0f1000 0f1106 0f104810 0f114e10 48897810 } // n = 7, score = 100 // 48897e10 | mov edi, 0x8000 // 48897e18 | dec eax // 0f1000 | arpl word ptr [edx + 0xc], dx // 0f1106 | dec ecx // 0f104810 | add edx, eax // 0f114e10 | dec esp // 48897810 | lea eax, [0xffff9808] $sequence_3 = { 4883ec20 488b5118 488bd9 4883fa10 7239 4c8b01 48ffc2 } // n = 7, score = 100 // 4883ec20 | mov ecx, esi // 488b5118 | dec eax // 488bd9 | shl ecx, 5 // 4883fa10 | dec eax // 7239 | mov dword ptr [esp + 0x78], esi // 4c8b01 | dec eax // 48ffc2 | cmp ecx, 0x1000 $sequence_4 = { 48c1ea3f 488d0409 4833d0 498d0410 4803d8 4c33cb 4d8bc1 } // n = 7, score = 100 // 48c1ea3f | dec eax // 488d0409 | mov edx, dword ptr [ebp + 0x20] // 4833d0 | dec eax // 498d0410 | lea edx, [ebp + 0x10] // 4803d8 | dec eax // 4c33cb | lea ecx, [esp + 0x70] // 4d8bc1 | dec esp $sequence_5 = { 4933d8 4c03cb 4933c9 4c894c2410 4c8be1 49c1ec3f 488d0409 } // n = 7, score = 100 // 4933d8 | dec eax // 4c03cb | shr edx, 0x18 // 4933c9 | dec eax // 4c894c2410 | shl ecx, 0x28 // 4c8be1 | dec eax // 49c1ec3f | xor ecx, edx // 488d0409 | dec eax $sequence_6 = { 483bc1 767a ebbe ff15???????? cc 4885c9 } // n = 6, score = 100 // 483bc1 | mov byte ptr [ebx], bh // 767a | jmp 0xd04 // ebbe | dec ecx // ff15???????? | // cc | mov edx, esp // 4885c9 | dec eax $sequence_7 = { e8???????? 33c0 4883c420 5b c3 8bd3 488bc8 } // n = 7, score = 100 // e8???????? | // 33c0 | add edi, ecx // 4883c420 | inc ecx // 5b | xor edx, edi // c3 | mov ebx, edx // 8bd3 | mov ecx, eax // 488bc8 | shr ecx, 0x1e $sequence_8 = { 488b5c2418 4803d1 41897f14 488b7c2430 4589570c 488d8a00000001 45897710 } // n = 7, score = 100 // 488b5c2418 | dec eax // 4803d1 | sub edi, eax // 41897f14 | dec eax // 488b7c2430 | lea eax, [ebp - 0x49] // 4589570c | dec eax // 488d8a00000001 | sub ebx, eax // 45897710 | dec eax $sequence_9 = { 4803d3 e8???????? b801000000 eb02 33c0 } // n = 5, score = 100 // 4803d3 | and al, 0xf // e8???????? | // b801000000 | inc esp // eb02 | mov byte ptr [ecx + 2], al // 33c0 | inc ecx condition: 7 of them and filesize < 263168 }
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